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Hi,
a 6ya Technician can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US. click here to Talk to a Technician (only for users in the US for now) and get all the help you need. Goodluck!

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as long as the color print cartridges remain in the printer you should be able to print in only black and white.
If the error message does not come up and prompt you to chose this option, you should be able to tell the
printer to print in black .

Hi there Error 50c This is for yours.
Regarding the Dell A940 "Error 50c"....the user guide doesn't seem to mention "Error 50c". They do, however, mention a "Cartridge Error" on page 52 of the manual. They claim this means that the printer has detected a short circuit (fuse/resister) in the cartridge. As you may or may not have noticed in the manual, this is what they recommend doing about it:

1) Press Power to turn the printer off.

2) Lift the printer cover/lid (scanner unit) until the scanner support holds it open.

3) Turn the printer on.The ink cartridge carrier moves and stops at the loading position unless the printer is busy.

4) Remove the color ink cartridge.

5) Lower the printer (scanner unit) until it is completely closed.If the error message displays again, replace the black cartridge with a new black cartridge.

If the error message does not display, repeat steps 1–3 and then go to step 6.

6) Reinstall the color cartridge and remove the black ink cartridge.

7) Lower the printer (scanner unit) until it is completely closed.

If the error message displays again, replace the color cartridge with a newcolor cartridge.If there is no error message (indicated by flashing lights), repeat steps 1–3 and then reinstall both ink cartridges.8) Lower the printer (scanner unit) until it is completely closed.

If you get the error message again, while both cartridges are installed, replace both of the cartridges.

Basically, what they want you to determine is,....if the short circuit is with the "black ink" cartridge or the "color ink" cartridge and then replace the cartridge that has the problem.

You may have to buy a new cartrige.Please all I ask is call back and just gave a vote, it will gave me some satisfaction to know am helping some one, so I will keep on helping.
All The Best: Pineworks

disregaurd any prior solutions in cleaning any contacts. that model doesnt have an electrical contact to clean. there are little magnets inside each color and black cartrige that work off a float mechanisim inside each one. when the levels get low the magnet indicates to the printer it is empty. unfortunately for you this stylis model as with all brother model printers wont work even if the color your setting up in the properties or settings feature are set to black and the black is full. its the companies way of forcing you into buying new ink. be aware though that my brother catriges cost 78.00 for the 3 color and one black set. i found these cartriges online through ebay but with one more additional black cartrige for a total of 5 not for ,for a total cost of 13.11 with free shipping. sounds too good to be true but for 13.00 it was worth a try. i have now purchased several 5 packs from them and couldnt be happiere.

1) With the printer powered off but connected to a power source, press the Power button while pressing and holdingthe Stop/ Reset button.2) When the Power LED is lit, press the Stop/Reset button two times while pressing and holding the Power button.3) When releasing the Power button and the Stop / Reset button (regardless of order), the printer will move into aservice mode. (Waiting for menu selection)4) When the LED lights in green, press the Stop/Reset button the specified number of time(s) according to thefunction listed in the table below.(Each time the Stop/Reset button is pressed, the LED lights alternately inorange and green, starting with orange.)The number of the Resetbutton pressingLED Function Remarks

0 time Green Power off1 time Orange Service pattern print2 times Green EEPROM print3 times Orange EEPROM reset4 times Green Waste ink counter reset See waste ink counter resetprocedures below.5 times Orange Destination setting See Destination settingprocedures below.6 times Green Print head deep cleaning11 times Orange Button / LCD checking12 or more times Returns to a menu selectionMP160 user guide:http://gdlp01.c-wss.com/gds/0900002716/mp160_ug_us_v5.pdfClick on this link or copy and paste the complete link into your browser.If I could be of further assistance, let me know. If this helps or solves the issue, please rate it.Thanks, Joe

i took out both printer cartriges then put them back in. there was a window that asks if you replaced the cartriges; click yes then click on the black and color boxes indicating you replaced (re-inserted) both cartriges. for me the light stopped blinking (previously, it was blinking orange 4 times). next i tried to print but only yellow and black appeared. i then cleaned the head 2 times.

to clean:
-go to control panel
-click on printers
-click on printers and faxes
-find your printer, right click on it
-click properties
-find the maintenance tab
-click cleaning
(clean a couple of times if needed)

Don't use refill cartridges, because it will damage your printer someday. and will cost your parts as brand new. so better use the original ink.

TRY THIS STEPS...
Mp150 Reset CounterService mode operation procedures -1) With the printer powered off but connected to a power source, press the Power button while pressing and holdingthe Stop/ Reset button.2) When the Power LED is lit, press the Stop/Reset button two times while pressing and holding the Power button.3) When releasing the Power button and the Stop / Reset button (regardless of order), the printer will move into aservice mode. (Waiting for menu selection)4) When the LED lights in green, press the Stop/Reset button the specified number of time(s) according to thefunction listed in the table below.(Each time the Stop/Reset button is pressed, the LED lights alternately inorange and green, starting with orange.)The number of the Resetbutton pressingLED Function Remarks0 time Green Power off1 time Orange Service pattern print 2 times Green EEPROM print 3 times Orange EEPROM reset4 times Green Waste ink counter reset See waste ink counter resetprocedures below.5 times Orange Destination setting See Destination settingprocedures below.6 times Green Print head deep cleaning11 times Orange Button / LCD checking12 or more times Returns to a menu selection
IF THIS STEPS DOESN'T WORK, YOU NEED TO BRING THE UNIT TO YOUR NEAREST SERVICE CENTER...